Which is the longest part of the digestive system?
The small intestine.
Choose the correct answer.
1. Our lungs get bigger.
What four body systems do participate in nutrition?
The digestive system, the respiratory system, the circulatory system and the excretory system.
__________ carry blood to the heart.
Veins
Where does gas exchange happen?
Gas exchange happens in the alveoli.
Choose the correct answer.
1. thin
Choose the correct answer.
2. relaxes
Choose the correct answer.
4. They filter the blood.
Choose the correct answer.
3. ureters and kidneys.
What organ does store urine?
The bladder.
What are the phases of the respiration process?
Inhalation, gas exchange and exhalation.
